package com.bdqn.t330.ch12.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class ConfigManager {
    private static Properties properties;
    private static ConfigManager configManager= new ConfigManager();
    private ConfigManager() {
        //读取配置文件非常消耗内存资源
        String configFile = "database.properties";
        properties = new Properties();
        InputStream is = ConfigManager.class.getClassLoader().getResourceAsStream(configFile);
        try {
            properties.load(is);
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public synchronized static ConfigManager getInstance() {
       // if (configManager == null) {
        //    configManager = new ConfigManager();
       // }
        return configManager;
    }
    public String getValue(String key){
        return properties.getProperty(key);
    }
}
